Abstract
To clarify the order parameter symmetry of cuprates, the magnetic penetration depth λ was measured along the crystallographic directions a, b, and c in single crystals of YBa2Cu4O8 via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of λ −2 a and λ −2 b exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with s+d-wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates.
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Khasanov, R., Shengelaya, A., Karpinski, J. et al. s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8 . J Supercond Nov Magn 21, 81–85 (2008). https://doi.org/10.1007/s10948-007-0302-z
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DOI: https://doi.org/10.1007/s10948-007-0302-z